Identification of critical flutter state of a hydrofoil based on Scanlan flutter derivative theory

DOI:	10.11809/bqzbgcxb2023.03.023
Keywords:	hydrofoil; flutter; flutter derivative; critical flutter state; Newmark β method
Abstract:	Flutter is a kind of self excited vibration with non attenuation amplitude. Flutter prediction of a hydrofoil has always been a difficulty in the field of hydroelasticity. In this paper, the Scanlan flutter derivative theory in the field of aerodynamics is introduced to identify the critical flutter state of a hydrofoil. Firstly, the flutter derivative of the hydrofoil is solved according to the theory, and the critical flutter state of the hydrofoil is obtained by combining with the critical flutter conditions.Then, the Newmark β method is used to verify and analyze the obtained results, which are in good agreement.Finally, the vibration state of the hydrofoil is briefly analyzed. The calculation conducted in this paper proves that Scanlan flutter derivative theory can be applied to the prediction of hydrofoil critical flutter state, which provides a new idea for the study of hydrofoil flutter.
Published:	2023-03-28
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